Chair control



FIG. 1 is a bottom perspective view of a chair control showing my new design;

FIG. 2 is a bottom view thereof;

FIG. 3 is an end elevational view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is an end elevational view of the opposite end thereof;

FIG. 6 is a side elevational view; and

FIG. 7 is a side elevational view of the opposite side. 

The ornamental design for a chair control, substantially as shown and described. 